A Letter on display at the Railway Museum

A Letter on display at the Railway Museum in New Delhi.

Believe It Or Not
It is little known that one Okhil Chandra Sen wrote this letter to the Sahibganj Divisional Railway Office in 1909. It is on display at the Railway Museum in New Delhi.
It was also reproduced under the caption "Travelers' Tales" in the Far Eastern Economic Review.
Okhil Babu's letter to the Railway Department :
"I am arrive by passenger train Ahmedpur station and my belly is too much swelling with jackfruit. I am therefore went to privy. Just I doing the nuisance that guard making whistle blow for train to go off and I am running with 'lotah' in one hand and 'dhoti' in the next when I am fall over and expose all my shockings to man and female women on plateform. It is too much shame shame for me. Then I am got leaved at Ahmedpur station.
This too much bad, if passenger go to make dung that stapid dam guard not wait train five minutes for him. I am therefore pray your honour to make big fine on that guard for public sake. Otherwise I am making big report to papers."

Any guesses why this letter was of historic value?
It apparently led to the introduction of Toilets on Trains.